CN105420432B - A kind of replacing options of blast furnace cooling stave - Google Patents

Abstract

The invention provides a method for replacing staves of a blast furnace. The replacement method of the invention realizes the operation of large-area and rapid replacement of staves without entering the furnace; the replacement method without entering the furnace can greatly reduce the impact of gas , high temperature, high-altitude falling objects and other unfavorable factors; and there is no residual iron, no need to open the residual iron door, no residual iron tank, no cleaning of residual iron slag in the furnace, etc., thus greatly reducing the construction time; no need Cut off the furnace skin in a large area to reduce the construction difficulty and work intensity, and reduce the stress of the furnace skin deformation after the blast furnace is re-aired; reduce the damage to the stave of the water cooling furnace, and prolong the service life of the blast furnace.

Description

A method for replacing cooling walls of blast furnace

technical field

The invention relates to the technical field of hoisting of blast furnace equipment, in particular to a method for replacing a cooling wall of a blast furnace.

Background technique

Blast furnace stave is one of the important cooling equipment of blast furnace, and its main material is cast iron, cast steel or copper. Due to the large bearing capacity, high temperature, and changes in the cooling capacity of the internal circulating water of the blast furnace stave, it is easy to cause different degrees of damage to the stave, and in severe cases, it may cause the blast furnace shell to burn through and cause leakage. The blast furnace stave is the main equipment for ironmaking, and the length of its maintenance time will directly affect the normal production of the blast furnace. The traditional method of large-scale replacement of the stave is to adopt the method of "shutdown-feeding line-outlet from the first section of the stave". The treatment process of residual iron - cleaning residual iron - entering the furnace to set up hanging pan - removing stave" is followed by the method of "installing cooling stave - removing hanging pan - spraying - restoring furnace skin - loading - air supply" , The cycle of this type of construction method is about 30 days.

For a long time, the cooling stave of the blast furnace has generally been replaced by people entering the furnace and setting hanging plates. In order to meet the conditions for people entering the furnace, it is necessary to lower the material line, put residual iron, open the door of the furnace skin, draw water in the furnace, and clean the furnace. After the slag is removed, the furnace is emptied, and then a hanging plate is installed, which makes the dismantling and installation of the cooling wall convenient, and the spraying and pointing effect is good. However, it takes a long construction period to adopt the method of entering and replacing people in the furnace, and the blast furnace needs to be shut down for a long time. And due to the limitation of the construction space, production rhythm and safety production of the production unit, there are practical problems such as complex site environment, tight construction period, narrow construction area, and insufficient hoisting space, which makes it impossible for the construction unit to replace cooling walls in a large area in a short period of time. , thereby reducing work efficiency.

Contents of the invention

The purpose of the present invention is to solve the problem of no people entering the furnace and no suspension plate when replacing cooling walls in a large area, so as to reduce the influence caused by unfavorable factors such as gas, falling objects, and high temperature. The construction method of replacing the stave.

In order to achieve the above object, a method for replacing a blast furnace stave provided by the present invention includes:

Step 1) Cut the furnace skin at the location where staves to be removed are concentrated to form an inspection door with the same size as the stave, and set up an electric hoist on the platform adjacent to the inspection door, and set up an electric hoist above the inspection door;

Step 2) After cutting off the joints of the first cooling water pipe and the second cooling water pipe exposed on the outside of the furnace shell on the cooling wall, the first cooling water pipe, the second cooling water pipe, the third cooling water pipe and the fourth cooling water pipe on the cooling wall The ends on the same side of the water pipes are all welded to the hoisting port, and a jack is set up outside the furnace shell, and the jack is set against the ends of the third cooling water pipe and the fourth cooling water pipe;

Step 3) After connecting a steel wire rope respectively on the hoisting ports of the first cooling water pipe and the second cooling water pipe, connect the two steel wire ropes with the electric winch outside the furnace shell through a shackle;

Step 4) Connect a steel wire rope to the hoisting ports of the third cooling water pipe and the fourth cooling water pipe respectively, and drive the jack to squeeze the third cooling water pipe and the fourth cooling water pipe, so that after the stave is separated from the furnace shell, the third cooling water pipe The two steel wire ropes connected with the fourth cooling water pipe are passed into the furnace, and at this time, the stave is hung in the furnace through the steel wire ropes connected with the first cooling water pipe and the second cooling water pipe;

Step 5) Remove the shackle after connecting the wire rope connected to the third cooling water pipe and the fourth cooling water pipe to the electric hoist, so that the wire rope connected to the first cooling water pipe and the second cooling water pipe is disconnected from the electric winch, and the cooling water pipe is connected to the electric hoist. The wall is hung out of the furnace from the inspection door;

Step 6) hoist the replaced stave into the furnace from the furnace roof through the electric hoist, and pull the steel wire rope connecting the stave to the electric hoist, so that the cooling water pipes on the stave are respectively plugged into the corresponding positions of the furnace shell, Finally, the joints are respectively welded on the cooling water pipes of the stave and the inspection door is sealed.

As a further improvement of the above technical solution, the jack in step 2) is fixed on the furnace shell through a gantry, and the gantry is welded outside the furnace shell.

As a further improvement of the above-mentioned technical scheme, the steel wire rope connected by the third cooling water pipe and the fourth cooling water pipe in the step 5) is also connected with the installation hole of the probe box, the large square hole, the ignition hole, and the cross temperature measuring device on the furnace roof. The installation hole is drawn into the steel wire rope connection in the furnace.

As a further improvement of the above technical solution, the annular seam and the vertical seam of the cooling wall replaced in the step 6) are all sealed by setting a sealing strip.

The advantage of the replacement method of a kind of blast furnace stave of the present invention is:

The replacement method of the present invention realizes the operation of rapid replacement of cooling walls in a large area without entering the furnace; adopting the replacement method without entering the furnace can greatly reduce the damage caused by unfavorable factors such as gas, high temperature, and falling objects. Dangerous; no residual iron, no need to open the residual iron door, no residual iron tank, no cleaning of residual iron slag in the furnace, etc., thus greatly reducing the construction time; no need to cut off the furnace skin in a large area to reduce construction difficulty and work intensity , and make the stress of the furnace skin deformation smaller after the blast furnace is revived; reduce the damage to the cooling wall of the cooling furnace, and prolong the service life of the blast furnace.

Description of drawings

Figure 1 is a top view of a blast furnace.

Fig. 2 is a schematic diagram of the furnace body structure of the blast furnace.

Fig. 3a is a schematic diagram of the structure of the gantry provided in the embodiment of the present invention.

Fig. 3b is a schematic diagram of installing the gantry shown in Fig. 3a.

Fig. 4a is a schematic diagram of the cold surface structure of the stave.

Fig. 4b is a schematic diagram of the thermal surface structure of the stave.

Fig. 4c is a structural schematic diagram of the cooling water pipe on the cooling wall.

Fig. 5 is a positional diagram of the inspection door and the electric hoist provided in the embodiment of the present invention.

reference sign

1. Furnace shell 2. Ignition hole 3. Probe box

4. Large square hole 5. Cross temperature measuring device 6. Platform

8. Stave 9. Inspection door 10. Electric hoist

11. Steel wire rope 12. Gantry frame 13. The first cooling water pipe

14. The third cooling water pipe 15. The fourth cooling water pipe 16. The second cooling water pipe

17. Electric hoist 18. Steel plate

detailed description

A method for replacing a blast furnace stave according to the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

Shown with reference to Fig. 1,2,3a, 3b, 4a, 4b, a kind of blast furnace stave replacement method of the present invention, described method comprises:

Step 1) Cut the furnace skin at the concentrated position of the stave 8 to be removed to form an inspection door 9 with the same size as the stave, and its quantity can be determined as 1-4 according to the number of staves to be replaced to facilitate Overhaul; set up an electric hoist 17 at the inspection door 9, and set an electric winch 10 on the nearest platform 6 of the inspection door 9;

Step 2) the joints of the first cooling water pipe 13 and the second cooling water pipe 16 exposed on the cooling water pipe outside the furnace shell are cut off to be flush with the furnace shell, the first cooling water pipe 13 on the stave 8, the second cooling water pipe 16, The ends of the third cooling water pipe 14 and the same side of the fourth cooling water pipe 15 are all welded to the hoisting mouth, that is, the ends of the four water pipes shown in Fig. The ends of three cooling water pipes 14 and the fourth cooling water pipe 15; for this, the portal frame 12 can be welded at the furnace shell of the cooling stave to be removed, for installing the jack; the structure of the portal frame 12 is as shown in Figure 3a As shown, it is welded on the furnace shell 1 of the blast furnace, and its specific position spans above the third stave water pipe 14 and the fourth cooling water pipe 15; the gantry can be directly cut and welded by a steel plate with a thickness of 25mm-35mm ;

Step 3) Bolt a steel wire rope on the hoisting openings at the tops of the first cooling water pipe 13 and the second cooling water pipe 16, and connect the two steel wire ropes with the electric hoist 10 outside the furnace through a shackle;

Step 4) Bolt a steel wire rope on the hoisting openings of the third cooling water pipe 14 and the fourth cooling water pipe 15, and use a jack to support the stave, that is, withstand the third cooling water pipe 14 and the fourth cooling water pipe 15 until the stave leaves the furnace At this time, the stave 8 is strenuously hung in the furnace by the steel wire rope connected by the first cooling water pipe 13 and the second cooling water pipe 16, and the two hoisting ports of the third cooling water pipe 14 and the fourth cooling water pipe 15 are bolted. The steel wire rope is threaded into the furnace;

Step 5) After the rope ends of the third cooling water pipe 14 and the fourth cooling water pipe 15 are inserted into the furnace, connect the wire ropes of the third cooling water pipe 14 and the fourth cooling water pipe 15 with the electric hoist 17 from the inspection door 9 , after the electric hoist 17 is used for hoisting, loosen the shackles on the rope buckle of the first cooling water pipe 13 and the second cooling water pipe 16 to disconnect the connection of the electric winch 10, and pull the old cooling wall through the electric hoist 17 from the maintenance Door 9 hangs out;

At this time, the large square hole 4 on the top of the furnace shown in Figure 1, the ignition hole 2 and the steel wire rope 11 that the probe box 3 hangs down in the furnace can be pulled to the inspection door with an iron hook, and connected with the third cooling water pipe 14 and the fourth cooling water pipe. The wire rope of the water pipe 15 is also connected, and the old stave is pulled out from the maintenance door 9 by the common driving action of the furnace roof hoist and the electric hoist, so as to reduce the connection between the third cooling water pipe 14 and the fourth cooling water pipe 15 and the electric hoist. The pressure of the steel wire rope, while avoiding the left and right shaking of the stave when hoisting, improves the stability of the movement.

Step 6) Hang the replaced stave into the furnace from the furnace roof through the electric hoist 10, and pull the steel wire rope connecting the stave to the electric hoist 10, so that each cooling water pipe on the stave is respectively plugged into the corresponding part of the furnace shell 1 On the position, at last weld the joints respectively on each cooling water pipe of the stave and seal the inspection door 9; for this, the first cooling water pipe 13 and the top of the second cooling water pipe 16 on the new stave can be provided with hoisting noses for Insert the wire rope, and use the winch 10 from the furnace roof to hoist the new cooling stave into the furnace from the large square hole 4.

In addition, since the size of the access door is the same as that of the stave, after all staves are replaced and installed, the stave can be directly embedded in the opening of the access door and welded at the four welds as shown in Figure 5 The steel plate 18 enables the stave to be closed while reducing the welding stress and reducing its structural deformation.

The ring seam and vertical seam of the hot surface of the new stave to be replaced can be sealed by setting a sealing strip. Before stave installation, weld two sealing strips with a thickness of 2mm, a length equal to the height of the stave, and a width equal to the size of the gap between the two staves installed, on one side of the vertical seam and the ring seam on the hot surface of the new stave. After the installation is in place, there is a sealing strip between the two staves. After the blast furnace is sprayed, the gap between the staves can be filled by grouting.

As shown in Figure 1, the platform 6 refers to the platform at the large square hole of the blast furnace. The large square hole 4 of the blast furnace, the ignition hole 2, the probe box 3, and the cross temperature measuring device 5 are removed, and a hoist 10 is set on the platform 6. , this moment, wire rope 11 can hang down in the furnace from the installation hole of probe box 3, the installation hole of generous hole 4, ignition hole 2, cross temperature measuring device 5.

The blast furnace stave replacement method in the above embodiments of the present invention is simple and easy to implement, the construction process is safe and controllable, and the requirements for construction technology level and technical difficulty are not high; during the construction process, there is less material waste, construction facilities can be reused, and time is occupied Short and easy to control the quality. The stave is replaced by the method, which prolongs the service life of the stave of the blast furnace, reduces the times of maintenance and improves the safety performance.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than limit them. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications or equivalent replacements to the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and all of them should be included in the scope of the present invention. within the scope of the claims.

Claims (4)

1. a kind of replacing options of blast furnace cooling stave, it is characterised in that including：

Step 1) stove skin is cut open in the position of cooling wall (8) concentration to be removed, formed and examined with cooling wall (8) size identical Door (9) is repaiied, and electrical hoist (10) is set on the platform (6) that maintenance door (9) is closed on, while the top in maintenance door (9) Set up electric block (17)；

Step 2) by the first cooling water pipe (13) being exposed on cooling wall outside furnace shell and the joint of the second cooling water pipe (16) After cutting off, the first cooling water pipe (13), the second cooling water pipe (16), the 3rd cooling water pipe (14) on cooling wall (8) and Hoisting port is welded in the end of four cooling water pipes (15) the same side, and sets up jack outside furnace shell (1), and the jack is supported and is located at The end of 3rd cooling water pipe (14) and the 4th cooling water pipe (15)；

Step 3) connect steel cable respectively on the hoisting port of the first cooling water pipe (13) and the second cooling water pipe (16) after, Two steel wire ropes are connected with electrical hoist (10) outside in furnace shell (1) by shackle；

Step 4) steel cable is connected respectively on the hoisting port of the 3rd cooling water pipe (14) and the 4th cooling water pipe (15), and Jack is driven to extrude the 3rd cooling water pipe (14) and the 4th cooling water pipe (15) so that after cooling wall (8) is separated with furnace shell (1) Two steel wire ropes that 3rd cooling water pipe (14) and the 4th cooling water pipe (15) are connected are penetrated in stove, and now cooling wall (8) leads to The steel wire rope for crossing the first cooling water pipe (13) and the second cooling water pipe (16) connection is hung in stove；

Step 5) steel wire rope of the 3rd cooling water pipe (14) and the connection of the 4th cooling water pipe (15) is connected with electric block (17) After remove shackle so that the steel wire rope that the first cooling water pipe (13), the second cooling water pipe (16) are connected with electrical hoist (10) Disconnect, and hung out cooling wall (8) outside stove from maintenance door (9) using electric block (17)；

Step 6) cooling wall of replacing is hung in stove by electrical hoist (10) from furnace roof, and draw the cooling wall with it is electronic The steel wire rope of hoist engine (10) connection so that each cooling water pipe on cooling wall is plugged on the corresponding position of furnace shell (1) respectively, Finally joint is respectively welded on each cooling water pipe of cooling wall and maintenance door (9) is sealed.

2. the replacing options of blast furnace cooling stave according to claim 1, it is characterised in that the step 2) in jack It is fixed on by portal (12) on furnace shell (1), described portal (12) is welded in furnace shell (1) outside.

3. the replacing options of blast furnace cooling stave according to claim 1, it is characterised in that the step 5) in the 3rd cooling Water pipe (14) and the 4th cooling water pipe (15) connection steel wire rope also with the mounting hole on furnace roof by stock rod case (3), big square hole (4), the mounting hole of fire hole (2) and cross temperature measurer (5) leads the steel wire rope connection in stove.

4. the replacing options of blast furnace cooling stave according to claim 1, it is characterised in that the step 6) in change it is cold But the hot face ring seam of wall, perps are by setting sealing strip to be sealed.